JP2000223072A - High-pressure discharge lamp, high-pressure discharge lamp device and liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp capable of raising sealing accuracy by sealing under a reduced pressure by suppressing occurrence of a phenomenon such as a destruction under the circumstances where a lamp is made a short-arcing type and is miniaturized. SOLUTION: When electrodes 5, 6 or metal foil parts 7a, 7b are sealed under a reduced pressure, if half the thickness (t2/2) of the sealed part for electrode axes 5b, 6b is set so as to make it thicker than the thickness t1 of a discharge space 4a and half the thickness (t2/2) of the sealed part for the metal foil parts 7a, 7b, a sealing speed at the electrode axes parts 5b, 6b is practically slowed down to a sealing speed equivalent to the sealing speed at the metal foil parts 7a, 7b, and entire strength of sealed parts 4b, 4c is increased. Therefore, even if a lamp is miniaturized, a destructive phenomenon caused by a crack and the like does not easily occur, and stable and highly accurate sealing becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short arc type high pressure discharge lamp, a high pressure discharge lamp device, and a liquid crystal projector which are close to a point light source.

[0002]

2. Description of the Related Art In recent years, floodlights and image display devices have become widespread, and high pressure discharge lamps are often used as light sources. Among them, in particular, short arc type high pressure discharge lamps, such as xenon lamps and metal halide lamps, which are close to a point light source and light distribution control is easy, are used as a light source for a liquid crystal projector which has been remarkably popular recently. It is being heavily used. Above all, a light source device that combines a metal halide lamp and a reflector, which is constituted only by an arc tube without using an outer tube, is promising because of its good color rendering properties and good luminous efficiency. In such a light source device that combines a metal halide lamp and a reflecting mirror, the optical use efficiency is improved by reducing the size of the arc tube and approaching a point light source.
Lighting at 30 W / cm ² or more enhances luminous efficiency.

A liquid crystal projector is a device for projecting an image formed on a liquid crystal screen, and can project either a still image or a moving image. Since various images can be projected by inputting a video signal or an image signal of a personal computer, it can be used as a presentation tool, or used as a simple theater or large-screen TV. Used in various fields.

[0004]

Since such a liquid crystal projector is still very expensive as compared with a TV or the like, the cost reduction by downsizing each component has been promoted as an improvement thereof. However, since the brightness has not yet reached a level acceptable in the market, improvement using a special optical system is being promoted.
In particular, in this type of apparatus, high-pressure discharge lamps are currently used to meet these requirements, but the demands are even more severe and improvements in short gaps, higher efficiency, and longer life are being promoted. .

[0005] Further, in order to reduce product costs, cost requirements for lamps are becoming severer, and it is necessary to obtain simple and high reliability.

In order to meet these demands, a process called "sealing" or "sealing" performed for forming an arc tube in a high-pressure discharge lamp is important. In this regard,
For example, a light emitting lamp having a structure described in JP-A-6-52830 is said to have high reliability, but it is difficult to stably secure the reliability. That is, it is very difficult to obtain stable reliability, and the smaller the lamp used in a liquid crystal projector or the like, the more the phenomenon such as rupture due to cracks occurs and the more stable the sealing is performed. It is difficult.

In such a high-pressure discharge lamp, the arc tube often contains at least mercury and a rare gas, and a halogen gas is often enclosed. However, as the size of the lamp is reduced as described above, the lamp becomes stable. It becomes difficult to enclose the amount of oxygen that has been obtained, and it becomes difficult to achieve a halogen cycle in which reliability is obtained.

Further, considering a light source device or the like used in combination with a reflecting mirror or the like, if the size of the optical system is increased and the efficiency is increased, the reflection of the light from the reflected light also acts, and the high pressure discharge lamp is used. The temperature of the entire arc tube also increases, and in particular, some lamps may be damaged due to insufficient pressure resistance due to the poor shape of the sealing portion as described above.

When considering a light source device or the like used in combination with a reflecting mirror or the like, the high-pressure discharge lamp has a base for mounting in a central support hole formed in the neck of the reflecting mirror. It is fixed with an insulating material such as cement. That is, the base is inserted into the center support hole of the neck portion of the reflector, the high-pressure discharge lamp is turned on, the lamp position is adjusted so as to have the characteristic value set on the screen surface, and then the lamp is turned off. A certain amount of alumina cement is injected between the support hole, the base, and the sealing portion, and heating is performed from the periphery, and the alumina cement is dried and solidified, thereby fixing the reflector and the high-pressure discharge lamp and integrating them. Let me. Thereafter, the power supply cable for the high-pressure discharge lamp is screwed and fixed to the base and the external lead wire. That is, the crimp terminal portion of the power supply cable wire is inserted into the screw portion at the tip of the base, and the washer is fixed by inserting a washer washer and tightening the screw. Between the base and the adhesive around the base is weak,
The lamp is likely to be damaged at the end of the base due to the stress caused by the screw tightening. In particular, as the size of the reflecting mirror is reduced, the diameter of the center support hole is also reduced, and the adhesive strength of the base portion tends to be further weakened.

Therefore, the present invention suppresses the occurrence of phenomena such as bursting even in a situation where the size is reduced due to a short arc, and increases the sealing accuracy by decompression sealing to stabilize the strength of the sealing portion. It is an object of the present invention to provide a high-pressure discharge lamp, a high-pressure discharge lamp device, and a liquid crystal projector using the same, which can be improved.

Further, according to the present invention, in a high-pressure discharge lamp in which at least mercury, a rare gas and a halogen gas are sealed in a discharge space, a stable amount of oxygen can be sealed and a halogen circulation process can be activated. An object is to provide a high-pressure discharge lamp, a high-pressure discharge lamp device, and a liquid crystal projector using the same.

Another object of the present invention is to provide a high-pressure discharge lamp, a high-pressure discharge lamp device, and a liquid crystal projector using the same, which can ease the use conditions of the lamp.

Further, the present invention provides a high-pressure discharge lamp capable of preventing the lamp from being damaged due to mounting of a terminal by increasing the adhesive strength when the base of the high-pressure discharge lamp is fixed with a base cement at the center support hole of the reflector. It is an object to provide an apparatus and a liquid crystal projector using the same.

[0014]

According to the first aspect of the present invention, there is provided a high-pressure discharge lamp according to the present invention, wherein a light-transmitting hermetic container having a spherical discharge space formed therein; a discharge medium sealed in the discharge space; A pair of electrodes arranged to face each other in the discharge space portion; a metal foil connected to these electrodes and drawn to the outside; a thickness t1 of the discharge space portion in the translucent hermetic container; T3 / 2>t1> t2, where t2 is the thickness of the sealed portion and t3 is the thickness of the sealed portion of the electrode.
/ 2 where the electrode and the metal foil portion are sealed under reduced pressure while satisfying the condition of / 2.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. A translucent airtight container is a material having fire resistance and airtightness capable of extracting visible light in a desired wavelength range generated by electric discharge to the outside and sufficiently withstanding a normal operating temperature of a high pressure discharge lamp. If it is, it may be formed of any material. For example, quartz glass, translucent alumina, ceramics such as YAG, or a single crystal thereof can be used. If necessary, a halogen-resistant or metal-resistant transparent coating may be formed on the inner surface of the translucent airtight container, or the inner surface may be modified. The discharge space portion is formed to have a spherical shape, and more specifically, is formed to have, for example, a spindle shape.

The high-pressure discharge lamp of the present invention may be operated by either AC or DC. Therefore, the pair of electrodes have the same structure in the case of AC driving, but in the case of DC driving, the mass and surface area are larger than those of the cathode side because the temperature of the anode generally rises sharply.

The present invention is particularly suitable for a short arc type. The short arc type is a so-called electrode stable type in which the arc discharge is stabilized by the electrodes by reducing the distance between a pair of electrodes formed in the translucent airtight container. For this reason, the light emission of the high-pressure discharge lamp can be made as close as possible to the point light source, and the light can be efficiently collected by an optical system such as a reflecting mirror or a lens.

In the case of a projection high-pressure discharge lamp such as a liquid crystal projector, a small short-arc metal halide high-pressure discharge lamp is used.
Practically, 6 mm or less is preferable. That is, if the distance between the electrodes exceeds 6 mm, the light source deviates from the point light source state, and the light-collecting characteristics of the optical system deteriorate. For example, when used for a liquid crystal projector, the screen illuminance decreases. Therefore, the short arc type high pressure discharge lamp in the present invention refers to a lamp having a distance between electrodes of 6 mm or less.
Further, it is preferably 4 mm or less, and especially 1 to 3 mm is optimal for a liquid crystal projector.

In the present invention, the discharge medium contains at least mercury. The discharge medium includes, in addition to mercury, practically noble gases. Xenon, argon, krypton and the like can be used as the starting gas and the noble gas acting as a buffer gas.
In particular, in the case of a metal halide type high pressure discharge lamp,
A metal halide of a luminescent metal is added to the discharge medium.

The pair of electrodes are formed of, for example, tungsten. Molybdenum foil is most commonly used as a metal foil connected to these electrodes and relayed to an external lead wire for external drawing.

The sealing portion is for holding the electrode inserted into the discharge space together with the metal foil.
It is intended for vacuum sealing, not crush sealing. Thus, the device is configured to operate at a tube wall load of 100 W / cm ² or more and a pressure during lighting of 100 atm or more.

The operation of the present invention is as follows. At the time of decompression sealing of the electrode or the metal foil portion, conventionally, the thickness of the discharge space portion, half the thickness of the sealed portion of the electrode, and half the thickness of the sealed portion of the metal foil are all any. Equivalent (about 2mm)
Therefore, the sealing at the electrode portion precedes and a speed difference is generated between the sealing at the metal foil portion and the rupture phenomenon due to cracks or the like is apt to occur, but in the present invention, the thickness of the discharge space portion is increased. At time t1, half the thickness (t3 / 2) of the sealed portion of the electrode is set to be thicker than half the thickness (t2 / 2) of the sealed portion of the metal foil, so that the thickness is substantially increased. Since the sealing speed at the electrode part is delayed and becomes equal to the sealing speed at the metal foil part, the strength of the whole sealing part increases, so that the burst phenomenon due to cracks etc. is unlikely to occur, and stable and accurate sealing is achieved. It becomes possible.

The high-pressure discharge lamp according to the second aspect of the present invention,
A translucent hermetic container having a spherical discharge space formed therein; a discharge medium sealed in the discharge space; a pair of electrodes arranged to face each other in the discharge space; Glass sleeves each interposed and fixedly held by a stop structure of a part of the electrode; metal foils connected to these electrodes and drawn out to the outside; electrodes and metal with the glass sleeve interposed A sealing portion in which the foil portion is sealed under reduced pressure.

A quartz sleeve or the like can be used as the glass sleeve. The glass sleeve only needs to have a length corresponding to the length of the electrode positioned at the sealing portion, and has a thickness of about 1.5 mm between the sealing portion and the metal foil. It is sufficient if it has. The stop structure provided on a part of the electrode is to prevent the glass sleeve interposed around the electrode from moving in the axial direction. It may be provided only on the space side. This stopping structure is formed, for example, by fixing a platinum wire to a predetermined portion of the electrode by welding.

The operation of the present invention is as follows. At the time of decompression sealing of the electrode or the metal foil portion, conventionally, the thickness of the discharge space portion, half the thickness of the sealed portion of the electrode, and half the thickness of the sealed portion of the metal foil are all any. Equivalent (about 2mm)
Therefore, since the sealing at the electrode portion precedes and causes a speed difference with the sealing at the metal foil portion, a burst phenomenon due to cracks or the like is likely to occur, but in the present invention, the sealing portion of the electrode is On the other hand, by interposing the glass sleeve in advance, the sealing speed at the electrode portion is substantially delayed and becomes equal to the sealing speed at the metal foil portion, and the strength of the entire sealing portion increases, so that cracks etc. The burst phenomenon is unlikely to occur, and stable and accurate sealing can be achieved. In addition, since the glass sleeve is interposed around the electrodes when viewed from the discharge space, an effect of preventing root discharge can be obtained.

The high pressure discharge lamp according to the third aspect of the present invention
A light-transmitting hermetic container having a spherical discharge space formed therein; a discharge medium containing at least mercury, a rare gas and a halogen gas and sealed in the discharge space; and disposed to face each other in the discharge space. A pair of electrodes whose at least one surface is oxidized; a metal foil connected to each of these electrodes and drawn out; and a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure.

Generally, the electrode is formed of tungsten W, and the electrode whose surface is oxidized contains a component of WO ₂ .

In the present invention, when the electrode or the metal foil portion of the high pressure discharge lamp in which the halogen gas is sealed is decompressed and sealed, the electrode is oxidized in advance, and the electrode is sealed in the discharge space including the oxygen. As a result, the amount of oxygen can be stably charged, so that the halogen circulation process is activated, and the performance as a high-pressure discharge lamp is improved.

The high-pressure discharge lamp according to the fourth aspect of the present invention
A translucent hermetic container made of quartz glass having a discharge space portion having a spherical shape and having an intermediate portion thicker than a thickness of a central portion of the discharge space portion and a thickness in the vicinity of both end sealing portions; A discharge medium sealed in the discharge space portion; a pair of electrodes arranged to face each other in the discharge space portion; and a metal foil connected to these electrodes and drawn out to the outside;
At both ends of the discharge space, a sealing part in which the electrode and the metal foil part are sealed under reduced pressure.

The high-pressure discharge lamp of the present invention has at least two
It has a high operating voltage of 00 bar and a wall load of 100 W /
It is designed under a high load such as cm ² and the use condition is very severe. It is also suitable for a short arc type high pressure discharge lamp in which the distance between a pair of electrodes is about 1.3 mm. Here, the discharge space portion of the translucent airtight container according to the present invention has a non-uniform wall thickness, is thick at an intermediate portion in the middle from one end side, has a reduced thickness at a central portion, and has a middle portion from the central portion. Has a thickness distribution such that it becomes thicker at the middle portion and becomes thinner at the other end.

In the present invention, since the discharge space portion of the translucent airtight container has a predetermined thickness distribution, the coldest portion disappears in the lighting / light-out operation, and all halides in the discharge space portion evaporate. As a result, it does not adhere to the tube wall of the discharge space portion, and therefore, the performance is exhibited for a long period of time. At the same time, all of the enclosed halides contribute to light emission, so that high luminous efficiency is obtained.

According to a fifth aspect of the present invention, there is provided a high-pressure discharge lamp device according to any one of the first to fourth aspects, wherein the high-pressure discharge lamp holds the high-pressure discharge lamp and emits light emitted from the high-pressure discharge lamp. And a concave reflecting mirror for reflecting light in the direction of.

It is appropriate that the high-pressure discharge lamp and the reflecting mirror are fixed in a predetermined positional relationship by a fixing means such as an adhesive such as a die cement. However, in some cases, the two are integrally formed in a detachable form. It may be fixed. Further, in order to fix the high-pressure discharge lamp to the reflecting mirror, a sealing portion of a light-transmitting airtight container can be used. Further, the high-pressure discharge lamp does not need to be entirely surrounded by the reflecting mirror, and, for example, the sealing portion of one electrode may protrude from the reflecting mirror to the outside. Further, the reflecting mirror itself may be made of glass or metal as a base. In any of the configurations, the use of a dichroic mirror having visible light reflection / heat ray transmission performance on the reflection surface can reduce the projection of heat rays on the surface to be irradiated. Note that a light-transmitting front cover may be attached to close the opening surface of the reflecting mirror. In this case, the space between the light-transmitting front cover and the reflecting mirror may be airtight, but need not be airtight. Further, in order to fix the translucent front cover to the reflecting mirror, it may be adhered with a silicone adhesive, or
You may make it fix mechanically with a metal frame. Furthermore, visible light can be transmitted to the inner or outer surface of the translucent front cover.
By forming the heat ray reflective film, heat rays projected on the surface to be irradiated can be blocked. In some cases, a function of a color filter that satisfactorily transmits light in a specific wavelength range with respect to visible light may be provided. In this way, if the opening surface of the reflecting mirror is closed with the translucent front cover, even if the high-pressure discharge lamp ruptures, the translucent front cover can prevent the fragments from being scattered around.

According to a sixth aspect of the present invention, there is provided a high-pressure discharge lamp device, comprising: a light-transmitting hermetic container having a spherical discharge space formed therein; a discharge medium sealed in the discharge space; , A metal foil connected to each of these electrodes and drawn out to the external lead wire side, a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure, and one of the sealing portions A high-pressure discharge lamp having a base provided on a side thereof and having a plurality of irregularities formed on an outer peripheral surface; a reflecting surface for reflecting light emitted from the high-pressure discharge lamp in a predetermined direction; and a base part of the high-pressure discharge lamp. A concave reflector having a central support hole for mounting the same; and a base cement for fixing a base inserted into the central support hole of the reflector.

The base in the high-pressure discharge lamp functions as an adhesive fixing portion for the reflecting mirror, and the large number of irregularities on the outer peripheral surface are, for example, fine irregularities formed by sandblasting. Has a contact area larger than 1 (where 1 is the case of a smooth outer peripheral surface). Particularly, irregularities in the circumferential direction are important, and irregularities such as a gear shape that is streaked in the axial direction may be used. The most common alumina cement may be used as the die cement.

According to the present invention, unlike a conventional die having a smooth outer peripheral surface, a large number of irregularities are formed on the outer peripheral surface. The adhesive force in the direction is increased. Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal portion of the power supply cable is inserted into the base, the washer is inserted and the screw is fixed by screwing is eliminated.

According to a seventh aspect of the present invention, there is provided a high-pressure discharge lamp device comprising: a light-transmitting airtight container having a spherical discharge space formed therein; a discharge medium sealed in the discharge space; , A metal foil connected to each of these electrodes and drawn out to the external lead wire side, a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure, and one of the sealing portions A high-pressure discharge lamp having a base provided on the side and having a plurality of slits formed in an axial direction on an outer peripheral surface; a reflecting surface for reflecting light emitted from the high-pressure discharge lamp in a predetermined direction; A concave reflector having a central support hole for mounting a base portion; and a base cement for fixing a base inserted into the central support hole of the reflector.

The number of slits formed in the base is not particularly limited as long as it is three or more. For example, about eight slits are preferable in consideration of a symmetric structure or the like. Further, it is preferable that the cut length of the slit has a length of 30% or more of the entire length of the die.

In the present invention, unlike the conventional die having a smooth outer peripheral surface, a plurality of slits are formed on the outer peripheral surface. The presence of the base cement portion penetrating inside increases the adhesive force in the rotation direction. Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal portion of the power supply cable is inserted into the base, the washer is inserted and the screw is fixed by screwing is eliminated. Furthermore, the base cement enters between the inside of the base and the outer periphery of the sealing part through the slit, and fixes the both, so that the cement bonding step is facilitated.

According to an eighth aspect of the present invention, the high-pressure discharge lamp of the high-pressure discharge lamp device according to the seventh aspect has a small-diameter portion in a part of the sealing portion located in the base, and a part of the base. It has a narrowed portion fitted to the small diameter portion of the sealing portion.

Both the small diameter portion and the narrowed portion are machined so that the diameter is slightly smaller than the outer diameter of the entire sealing portion and the outer diameter of the entire die, and the narrowed portion protruding on the inner peripheral surface side of the die is formed. Any shape can be used as long as it can fit into the small diameter portion.

In the present invention, in addition to the seventh aspect of the present invention, when the sealing portion is inserted into the base and the small-diameter portion and the throttle portion are fitted, the discharge space portion is formed by the spring action of the throttle portion. The center and the center of the base are aligned with each other, which facilitates alignment.

According to a ninth aspect of the present invention, there is provided a liquid crystal projector according to any one of the fifth to eighth aspects, a liquid crystal display panel irradiated with light from the high pressure discharge lamp, A liquid crystal driving device that drives the liquid crystal display panel; and an optical system that projects light that has passed through the liquid crystal display panel onto a surface to be projected.

In the present invention, by using the high-pressure discharge lamp device according to any one of claims 5 to 8 as a light source device, a point light source, high efficiency, and the like can be properly achieved. A good liquid crystal projector can be provided.

[0045]

FIG. 1 shows a first embodiment of the present invention.
A description will be given with reference to FIG. This embodiment shows an example of application to a high-pressure discharge lamp in a high-pressure discharge lamp device applied to a light source of a liquid crystal projector. FIG. 1 is an overall front view showing the structure of a high-pressure discharge lamp 1 of the present embodiment, FIG. 2 is a longitudinal sectional front view showing the structure of a high-pressure discharge lamp device 2 incorporating the high-pressure discharge lamp 1, and FIG. Liquid crystal projector 3 in which device 2 is incorporated as a light source device
FIG. 4 is an enlarged partial front view showing a main part of the high-pressure discharge lamp 1 shown in FIG.

In FIG. 1, 4 is a translucent airtight container, 5 is an anode which is one of a pair of electrodes, 6 is a cathode which is the other of the pair of electrodes, 7a and 7b are a pair of metal foils, and 8a and 8b are The external lead wire 9 is a base.

The transparent airtight container 4 has an outer diameter of 8.0 mm, for example.
And a discharge space portion 4a and a pair of sealing portions 4b and 4c. The discharge space portion 4a has a spherical shape, more specifically, a spindle shape. Translucent airtight container 4
Inside, argon and mercury are sealed as a discharge medium.

The anode 5 is made of tungsten and has an anode main part 5a and an electrode shaft 5b. The anode main part 5a has a diameter of 2.
6 mm, and is supported by the tip of the electrode shaft 5b. The anode 5 is supported by the translucent airtight container 4 with the base end of the electrode shaft 5b loosely inserted into the sealing portion 4b. The cathode 6 is made of tungsten and has a cathode main portion 6a and an electrode shaft 6b. The cathode main part 6a is formed by shaping the tip of an electrode shaft 6b having a diameter of 0.7 mm into a pointed shape, for example, by winding a tungsten coil. The cathode 6 is supported by the translucent airtight container 4 with the base end of the electrode shaft 6b loosely inserted into the sealing portion 4c.

The metal foils 7a and 7b are, for example, 28 μm thick,
The electrode shafts 5a and 6a are welded to one end of the molybdenum foil and the external lead wires 7a and 7b are welded to the other end of the molybdenum foil.
4c is hermetically buried inside.

The external lead wires 7a, 7b are drawn out from the sealing portions 4b, 4c of the light-transmitting airtight container 4.
Here, the external lead wire 7 a on the anode 5 side is connected to the base 9. The base 9 includes a cylindrical body 9a and an anode terminal 9b. The cylindrical body 9a is made of, for example, stainless steel, and one end is fixed to an end of the sealing portion 4b of the translucent airtight container 4 with a base cement (not shown). Although not particularly shown, the anode terminal 9b protrudes from the other end of the cylindrical body 9a, and is connected to the external lead wire 7a via a stranded wire inside the cylindrical body 9a.
It is connected to the.

Such a high-pressure discharge lamp 1 is, for example, shown in FIG.
As shown in FIG. 1, the lamp is mounted on a concave reflecting mirror 10 and used as a high-pressure discharge lamp device 2 such as a light source device. The reflecting mirror 10 includes a glass substrate 10a having a concave inner surface, a visible light reflecting / heat ray transmitting film 10b, and a cylindrical portion 10c. The glass substrate 10a has a concave portion on the inner surface formed into a curved surface shape based on a paraboloid of revolution, and a cylindrical portion 10c integrally formed outside the top portion to protrude. The visible light reflecting / heat ray transmitting film 10b is a dichroic reflecting film.

In order to mount the high-pressure discharge lamp 1 on the reflecting mirror 10, the base 9 is provided with a central support hole 1 formed in the cylindrical portion 10c.
0d, and the emission center of the high-pressure discharge lamp 1 is
The two are fixed to each other by interposing a base cement 11 between the base 9 and the central support hole 10d so as to match the focus of 0. The conducting wire 12 is welded to the external lead wire 8b on the side of the cathode 6 and led out from the opening end of the reflecting mirror 10. Therefore, if the DC output terminal of the lighting device is connected between the conducting wire 12 and the anode terminal 9b, the high-pressure discharge lamp 1 can be turned on.

Light rays generated from the high-pressure discharge lamp 1 are incident on the visible light reflecting / heat ray transmitting film 10b of the reflecting mirror 10, and the visible light is reflected and emitted parallel to the optical axis. on the other hand,
The heat rays pass through the visible light reflecting / heat ray transmitting film 10b, further pass through the glass base 10a, and are radiated to the back side of the reflecting mirror 10.

FIG. 3 shows a configuration example of a liquid crystal projector 3 using the high-pressure discharge lamp device 2 as a light source device. A liquid crystal display panel 16 sandwiched between a pair of polarizing plates 14 and 15 is provided on a projection optical path from the high-pressure discharge lamp device 2 to the screen 13, and further, for example, between the liquid crystal display panel 16 and the screen 13. An optical system 19 based on a combination of a Fresnel lens 17 and a projection lens 18 is provided. The liquid crystal display panel 16 displays various images to be projected and displayed on the screen 3 and is connected to a liquid crystal driving device (not shown). Incidentally, reference numeral 20 denotes a UV-IR filter.

In this embodiment, the sealing portions 4b and 4c of the high-pressure discharge lamp 1 are not crush-sealed but sealed under reduced pressure, and as shown in FIG. The thickness of the discharge space portion 4a of the hermetic container 4 is t1, the thickness of the sealed portion of the metal foils 7a and 7b is t2, and the electrode shafts 5b and 6b.
When the thickness of the sealed portion is represented by t3, the thickness distribution has the following relationship: t3 / 2>t1> t2 / 2. Specifically, t1
= 3 mm, t2 / 2 = 2 mm, t3 / 2 = 3.5 mm.

Therefore, the electrode shafts 5b, 6b, the metal foils 7a,
At the time of vacuum sealing of the 7b portion, conventionally, the thickness of the discharge space portion, half the thickness of the sealed portion of the electrode shaft, and half the thickness of the sealed portion of the metal foil are all equal ( (Approximately 2 mm), pressure reduction sealing at the electrode portion takes precedence, and a speed difference is generated between the sealing at the metal foil portion and the rupture phenomenon due to cracks or the like is likely to occur. For example, for the thickness t1 of the discharge space 4a and half the thickness (t2 / 2) of the sealed portion of the metal foils 7a and 7b, the electrode shafts 5b and 6b
The thickness (t3 / 2) of the half of the sealing portion is set to be thicker, so that the sealing speed at the electrode shafts 5b and 6b is substantially delayed, and the thickness at the metal foils 7a and 7b is reduced. It is equivalent to the sealing speed. Thereby, even when the lamp is downsized, the strength of the entire sealing portions 4b and 4c increases,
Burst phenomena due to cracks and the like are unlikely to occur, and stable and highly accurate sealing can be achieved.

A second embodiment of the present invention will be described with reference to FIG. The same portions as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted (the same applies to each of the following embodiments). 5A and 5B show the structure of the high-pressure discharge lamp 21 of the present embodiment, wherein FIG. 5A is a partial cross-sectional view before decompression sealing, and FIG. 5B is a partial cross-sectional view after decompression sealing.

In this embodiment, the thickness of the translucent airtight container 4 is substantially uniform including the discharge space portion 4a and the sealing portions 4b, 4c. In this case, a glass sleeve 22 made of quartz glass is provided in advance. That is, the glass sleeve 22 made of the same material as the translucent airtight container 4 is formed in the same length as the electrode shafts 5b and 6b, and is interposed in advance on the electrode shafts 5b and 6b. Are metal foils 7a and 7b fixed by welding
The inner end, which is on the side of the discharge space 4a, is stopped at a predetermined position of a part of the electrode shafts 5b, 6b by a stopper structure 23 formed in a projecting shape so as not to move. The other points are the same as those of the high-pressure discharge lamp 1, and can be used instead of the high-pressure discharge lamp device 2 and the high-pressure discharge lamp 1 in the liquid crystal projector 3.

Therefore, the electrode shafts 5b, 6b, the metal foils 7a,
In the present embodiment, when the decompression sealing of the portion 7b is performed, the thickness of the discharge space 4a, half the thickness of the sealed portion of the electrode shafts 5b and 6b, and the thickness of the metal foils 7a and 7b are formed in the same manner as in the related art. The thickness of half of the sealing part is the same (about 2 mm),
Glass sleeve 2 is applied to the sealed portions of electrode shafts 5b and 6b.
2 in advance, the electrode shafts 5b, 6b
The sealing speed at the portions is delayed and becomes equal to the sealing speed at the metal foils 7a and 7b, and the strength of the entire sealing portions 4b and 4c increases. FIG. 5B shows the result of the decompression sealing, and as a result, as in the case of FIG.
The steps b and 6b have a stepped structure in which the thickness of the sealed portion is increased. Thus, even when the lamp is miniaturized, the rupture phenomenon due to cracks or the like is unlikely to occur, and stable and accurate sealing can be achieved. The discharge space 4a
The glass sleeve 22 around the electrode shafts 5b and 6b
Is interposed, so that an effect of preventing root discharge can be obtained.

A third embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a high-pressure discharge lamp 31 of the present embodiment.
1 is an overall front view showing the structure of FIG.

The high-pressure discharge lamp 31 of the present embodiment is intended for vacuum sealing and has a tube wall load of 100 W / c.
If it is configured to operate at m ² or more and the pressure during lighting is 100 atm or more, the shape is the same as that of the conventional type that is sealed by vacuum sealing (ie,
A shape in which the glass sleeve 22 in FIG. 5 is eliminated),
Instead of the anode 5 and the cathode 6 simply made of tungsten, an anode 32 and a cathode 33 whose surfaces are oxidized (although only one may be used) are used as a pair of electrodes. The other points are the same as in the case of the high-pressure discharge lamp 1.
Can be used instead of

According to the present embodiment, the anode 32 and the cathode 33 are oxidized in advance when the electrode shafts 32b, 33b or the metal foils 7a, 7b of the high-pressure discharge lamp 31 in which the halogen gas is sealed are decompressed and sealed. Therefore, the oxygen can be sealed in the discharge space 4a, and even if the lamp is downsized, the amount of oxygen is stably sealed, so that the halogen circulation process is activated and the high-pressure discharge is performed. The performance as the lamp 31 is improved.

A fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 shows an example of the thickness distribution of the discharge space portion.
(A) is a sectional view showing the thickness distribution of the discharge space in the high-pressure discharge lamp 41 of the present embodiment, (b) is a sectional view showing the thickness distribution of the conventional general discharge space, and (c) is a special example. Fairness 4
FIG. 4 is a cross-sectional view illustrating a thickness distribution of a discharge space portion according to the example of Japanese Patent No. 32497.

In this case, it is assumed that the system is designed to have a high operating voltage of at least 200 bar, a high load such as a tube wall load of 100 W / cm ^{2, and} extremely severe use conditions. First, in the conventional general case, as shown in FIG. 7 (b), the thickness of the translucent airtight container 4 forming the discharge space 4a is substantially uniform from the thickness T1 at the center to the thickness T2 at the sealing portions at both ends. (T1 = T2). In the example of Japanese Patent Publication No. 4-32497, the thickness distribution (T1> T2) is such that the thickness increases sequentially from the thickness T2 of the sealing portion at both ends to the thickness T1 at the center as shown in FIG. By doing so, a lens function is provided. In this regard, in the present embodiment,
As shown in FIG. 7 (a), the discharge space portion 4a is not uniform in thickness, but becomes thicker in the middle part from one end side, becomes thinner in the center part, and becomes thinner in the middle part from the center part. The thickness distribution is such that the portion becomes thicker and the other end side becomes thinner. That is, the thickness T1 of the central portion and the thickness T of the sealing portions at both ends.
2 has a thick intermediate portion T3> T1, T2. Other than this, the high pressure discharge lamp 1
This is the same as the above case, and can be used instead of the high pressure discharge lamp device 2 and the high pressure discharge lamp 1 in the liquid crystal projector 3.

According to the present embodiment, since the discharge space portion 4a has the above-mentioned predetermined thickness distribution, the lighting space
In the light-off operation, the coldest part disappears, and all the halide in the discharge space part 4a evaporates and does not adhere to the tube wall of the discharge space part 4a, so that the performance is exhibited for a long time. At the same time, all of the enclosed halides contribute to light emission, so that high luminous efficiency is obtained. This embodiment is suitable for a short arc type high pressure discharge lamp in which the distance between a pair of electrodes is about 1.3 mm.

A fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a vertical sectional front view showing the structure of the base connection portion of the high-pressure discharge lamp device 51 of the present embodiment. An example of application to the entire high-pressure discharge lamp device and the liquid crystal projector is the same as in the case of FIGS.

As the high-pressure discharge lamp 52 used in this embodiment, a large number of irregularities 53b for increasing the surface area by sandblasting are formed on the outer peripheral surface of a cylindrical body 53a of a base 53 thereof. 53c
Is an anode terminal formed in a screw structure.

The mounting of the high-pressure discharge lamp 52 having such a configuration on the reflector 10 will be described. The base 53 is inserted into the center support hole 10d at the neck of the reflector 10, and the high-pressure discharge lamp 52 is turned on to adjust the lamp position so as to have the characteristic value set on the screen 13, and then the high-pressure discharge lamp The lamp 52 is turned off, a fixed amount of a base cement 54 made of alumina cement is injected between the center support hole 10d, the base 53, and the sealing parts 4b, 4c, and heating is performed from the periphery thereof to dry and harden the base cement 54. Thereby, the reflecting mirror 10 and the high-pressure discharge lamp 52 are fixed and integrated. Thereafter, a power supply cable line 55 for the high-pressure discharge lamp 52 is connected to the anode terminal 53c having a screw structure.
The crimp terminal 55a is inserted, a washer 56 is inserted, and the screw is tightened to fix. Here, unlike the conventional base having a smooth outer peripheral surface, a large number of irregularities 53b are formed on the outer peripheral surface. Therefore, when the base is fixed to the central support hole 10d of the reflecting mirror 10 by the base cement 54, the rotation direction Adhesive strength to According to the experiment, the adhesive strength of the base portion to the cement was increased from 20 Newton to 40 Newton or more.
Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal 55a of the power supply cable 55 is inserted into the base 53 and the washer 56 is inserted and fixed by screwing is eliminated.

A sixth embodiment of the present invention will be described with reference to FIG. FIGS. 9A and 9B show the structure of the base connection portion of the high-pressure discharge lamp device 61 according to the present embodiment, wherein FIG. 9A is a vertical sectional front view, and FIG. is there. An example of application to the entire high-pressure discharge lamp device and the liquid crystal projector is the same as in the case of FIGS.

The high pressure discharge lamp 62 used in the present embodiment has a base 63 having a plurality of slits 63b formed on the outer peripheral surface of a cylindrical body 63a. 63c is an anode terminal formed in a screw structure.
Here, the slit 63b is formed in the discharge space 4a of the cylindrical body 63a.
It is notched at a predetermined depth from the side end. Specifically, the lamp fixing part length of the base 63 is 11 mm,
The slit 63b is formed by making eight cuts at an interval of 45 degrees with an inner diameter of 6.2 mm, a width of 1 mm, and a depth of 7 mm.

The mounting of the high-pressure discharge lamp 62 having such a configuration on the reflector 10 will be described. The base 63 is inserted into the central support hole 10d at the neck of the reflector 10, and the high pressure discharge lamp 62 is turned on to adjust the lamp position so as to have the characteristic value set on the screen 13, and then the high pressure discharge lamp 62 is turned off, a fixed amount of a base cement 54 made of alumina cement is injected between the center support hole 10d, the base 63, and the sealing parts 4b, 4c, and heating is performed from the periphery thereof to dry and solidify the base cement 54. Thereby, the reflecting mirror 10 and the high-pressure discharge lamp 62 are fixed and integrated. Thereafter, the power supply cable line 55 for the high-pressure discharge lamp 62 is connected to the screw structure anode terminal 63c.
The crimp terminal 55a is inserted, a washer 56 is inserted, and the screw is tightened to fix. Here, unlike the conventional die having a smooth outer peripheral surface, eight slits 63c are formed on the outer peripheral surface. Therefore, when the die is fixed to the central support hole 10d of the reflecting mirror 10 by the die cement 54, its rotation The adhesive force in the direction is increased. Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal 55a of the power supply cable 55 is inserted into the base 63 and the washer 56 is inserted and fixed by screwing is eliminated. Furthermore, as shown in FIG. 9 (b), the base cement 54 enters between the inside of the base 63 and the outer periphery of the sealing portion 4b through the slit 63b to fix the both, and the cement bonding step is performed. Becomes easier.

A seventh embodiment of the present invention will be described with reference to FIG. FIG. 10 is a vertical sectional front view showing the structure of the base connection portion of the high-pressure discharge lamp device 71 of the present embodiment. An example of application to the entire high-pressure discharge lamp device and the liquid crystal projector is the same as in the case of FIGS.

The high-pressure discharge lamp 72 used in this embodiment is the same as the high-pressure discharge lamp 62 in the sixth embodiment.
And a small-diameter portion 73a is formed in a part of the sealing portion 73 located in the base 63.
On the side, a throttle portion 63d fitted to the small-diameter portion 73a
Are formed over the entire circumference. More specifically, a narrowed portion 63d having a depth of about 0.3 mm is formed all around the cylindrical body 63a of the base 63 at a position about 3 mm from the opening thereof, and the high-pressure discharge lamp 72 is sealed. In a part of the attachment portion 73, a small-diameter portion 73a narrowed to be smaller than the outer diameter of the sealing portion 73 in accordance with the shape of the base is formed by partial molding.

Therefore, when attaching the base 63, the sealing portion 73 is inserted into the base 63 so that the small-diameter portion 73a
When 3d is fitted, the center of the discharge space portion and the center of the base are aligned by the spring action of the drawn throttled portion 63d, which facilitates positioning. Thereafter, as in the case of the sixth embodiment, the base 63 is inserted into the center support hole 10d and fixed with the base cement 54. At this time, since the base cement 54 also enters the small diameter part 73a and the narrowed part 63d, the base 63 and the sealing part 7
3 further increases the adhesive strength.

[0075]

According to the high pressure discharge lamp of the first aspect of the invention, the thickness of the discharge space is t1, the thickness of the metal foil sealing portion is t2, and the thickness of the electrode sealing portion is t3. In this case, the condition of t3 / 2>t1> t2 / 2 was satisfied, so that the sealing speed at the electrode portion was substantially reduced to be equal to the sealing speed at the metal foil portion. This increases the strength of the entire sealing portion, so that a rupture phenomenon due to a crack or the like is unlikely to occur, and stable high-precision sealing can be achieved.

According to the high pressure discharge lamp of the second aspect of the present invention, the sealing speed at the electrode portion is substantially reduced by previously interposing the glass sleeve on the sealing portion of the electrode. By making the sealing speed equal to the sealing speed at the portion, the strength of the entire sealing portion is increased, so that a burst phenomenon due to cracks or the like is unlikely to occur, and stable and accurate sealing can be performed. In addition, since the glass sleeve is interposed around the electrodes when viewed from the discharge space, an effect of preventing root discharge can be obtained.

According to the high-pressure discharge lamp of the third aspect of the present invention, when the electrode or the metal foil portion of the high-pressure discharge lamp in which the halogen gas is sealed is decompressed and sealed, the electrode is previously oxidized, and the oxygen is removed. Since the gas can be sealed in the discharge space and a stable amount of oxygen is sealed, the halogen circulation process is activated, and the performance as a high-pressure discharge lamp is improved.

According to the high pressure discharge lamp of the fourth aspect of the present invention, since the discharge space portion of the light-transmitting airtight container has a predetermined thickness distribution, the coldest portion is eliminated in the lighting / light-out operation. All the halides in the discharge space will evaporate, and will not adhere to the tube wall of the discharge space, thus exhibiting performance over a long period of time. At the same time, all of the enclosed halides contribute to light emission, so that high luminous efficiency is obtained.

According to the high-pressure discharge lamp device of the fifth aspect of the present invention, since the high-pressure discharge lamp according to any one of the first to fourth aspects is used, downsizing of the lamp and short arcing are required. Even in this case, a good high-pressure discharge lamp device can be provided.

According to the high-pressure discharge lamp device of the present invention, unlike the conventional die having a smooth outer peripheral surface, a large number of irregularities are formed on the outer peripheral surface. When fixed to the hole, the adhesive force in the rotation direction becomes stronger. Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal portion of the power supply cable is inserted into the base, the washer is inserted and the screw is fixed by screwing is eliminated.

According to the high-pressure discharge lamp device of the present invention, a plurality of slits are formed on the outer peripheral surface unlike the conventional die having a smooth outer peripheral surface.
When fixed to the center support hole of the reflecting mirror by the base cement, the presence of the base cement part entering the slit increases the adhesive force in the rotation direction. Therefore, the problem that the lamp is broken at the end of the base by the stress when the crimp terminal portion of the power supply cable is inserted into the base, the washer is inserted and the screw is fixed by screwing is eliminated.
Furthermore, the base cement enters between the inside of the base and the outer periphery of the sealing part through the slit, and fixes the both, so that the cement bonding step is facilitated.

According to the eighth aspect of the present invention, in addition to the seventh aspect, when the sealing portion is inserted into the base and the small-diameter portion and the narrowed portion are fitted, the spring of the narrowed portion is formed. By the action, the center of the discharge space and the center of the base are aligned with each other, and the alignment is facilitated.

According to the liquid crystal projector of the ninth aspect of the present invention, by using the high pressure discharge lamp device according to any one of the fifth to eighth aspects as a point light source, it is possible to appropriately realize a point light source, high efficiency, and the like. Therefore, a high-performance liquid crystal projector can be provided.

[Brief description of the drawings]

FIG. 1 is an overall front view showing the structure of a high-pressure discharge lamp according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing the structure of the high-pressure discharge lamp device.

FIG. 3 is a front view illustrating a configuration example of a liquid crystal projector.

FIG. 4 is an enlarged partial front view showing a main part of the high-pressure discharge lamp.

FIG. 5 shows a structure of a high-pressure discharge lamp according to a second embodiment of the present invention, wherein (a) is a partial cross-sectional view before sealing under reduced pressure, and (b).
FIG. 3 is a partial cross-sectional view after vacuum sealing.

FIG. 6 is an overall front view showing a structure of a high-pressure discharge lamp according to a third embodiment of the present invention.

7A and 7B show an example of a thickness distribution of a discharge space, FIG. 7A is a cross-sectional view showing a thickness distribution of a discharge space in a high-pressure discharge lamp according to a fourth embodiment of the present invention, and FIG. FIG. 4C is a cross-sectional view showing a thickness distribution of a general discharge space portion, and FIG.
FIG. 2 is a cross-sectional view showing a thickness distribution of a discharge space portion according to the example of Japanese Patent No. 2497.

FIG. 8 is a vertical sectional side view showing a structure of a base connection portion of a high-pressure discharge lamp device according to a fifth embodiment of the present invention.

FIGS. 9A and 9B show a structure of a base connection portion of a high-pressure discharge lamp device according to a sixth embodiment of the present invention, wherein FIG. 9A is a longitudinal sectional front view, and FIG. It is a longitudinal side view shown.

FIG. 10 is a vertical sectional front view showing a structure of a base portion of a high-pressure discharge lamp according to a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... High pressure discharge lamp 2 ... High pressure discharge lamp device 4 ... Translucent airtight container 4a ... Discharge space part 4b, 4c ... Sealing part 5, 6 ... Electrode 7a, 7b ... Metal foil 8a, 8b ... External lead wire 9 ... Base 10 ... Reflection mirror 10d ... Center support hole 16 ... Liquid crystal display panel 19 ... Optical system 21 ... High pressure discharge lamp 22 ... Glass sleeve 23 ... Stopping structure 31 ... High pressure discharge lamp 32,33 ... Electrode 41 ... High pressure discharge lamp 51 ... High pressure Discharge lamp device 52 ... High pressure discharge lamp 53 ... Base 53b ... Concavity and convexity 54 ... Base cement 61 ... High pressure discharge lamp device 62 ... High pressure discharge lamp 63 ... Base 63b ... Slit 63d ... Narrow part 71 ... High pressure discharge lamp device 72 ... High pressure discharge lamp 73 ... sealing part 73a ... small diameter part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Furuya 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (72) Inventor Hisashi Yoshida 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation (72) Inventor Tetsuo Otani 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation F-term (reference) 5C039 HH03 HH15 5C043 AA12 AA14 CC03 DD11 EA01 EC02 5C058 AB06 BA35 EA13 EA26 EA51 5G435 AA00 AA03 BB12 FF03 FF05 GG05 GG16 GG28 GG46 KK07 LL15

Claims (9)

[Claims] 1. A light-transmitting airtight container having a spherical discharge space formed therein, a discharge medium sealed in the discharge space, and a pair of electrodes arranged to face each other in the discharge space; A metal foil connected to each of these electrodes and pulled out to the outside; the thickness of the discharge space in the light-transmitting airtight container is t1, the thickness of the sealing portion of the metal foil is t2, and the thickness of the sealing portion of the electrode is When the wall thickness is t3, t3 / 2>t1> t2 /
A high-pressure discharge lamp comprising: a sealing portion that satisfies the two conditions and seals the electrode and the metal foil portion under reduced pressure. 2. A light-transmitting hermetic container having a spherical discharge space formed therein, a discharge medium sealed in the discharge space, and a pair of electrodes arranged to face each other in the discharge space. A glass sleeve interposed around each of these electrodes and fixedly held by a stop structure of a part of the electrodes;
A high-pressure discharge lamp comprising: a metal foil connected to each of these electrodes and drawn out; and a sealing portion in which the electrode and the metal foil portion on which the glass sleeve is interposed are vacuum-sealed. 3. A light-transmitting hermetic container having a spherical discharge space formed therein; a discharge medium containing at least mercury, a rare gas and a halogen gas and sealed in the discharge space; A pair of electrodes arranged so as to be oxidized and at least one surface thereof being oxidized; a metal foil connected to each of these electrodes and drawn out; and a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure. A high-pressure discharge lamp comprising: 4. A translucent quartz glass having a spherical discharge space formed therein and having an intermediate portion which is thicker than a thickness of a central portion of the discharge space and a thickness in the vicinity of both end sealing portions. An airtight container; a discharge medium sealed in the discharge space; a pair of electrodes arranged to face each other in the discharge space; a metal foil connected to each of these electrodes and drawn out to the outside; A high-pressure discharge lamp comprising: a sealing portion in which electrodes and metal foil portions are vacuum-sealed at both ends of the space. 5. A high-pressure discharge lamp according to any one of claims 1 to 4, and a concave reflector for holding the high-pressure discharge lamp and reflecting light emitted from the high-pressure discharge lamp in a predetermined direction. A high-pressure discharge lamp device comprising: 6. A light-transmitting hermetic container having a spherical discharge space formed therein, a discharge medium sealed in the discharge space, and a pair of electrodes arranged to face each other in the discharge space. A metal foil connected to each of these electrodes and drawn out to the external lead wire side; a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure; and a large number of irregularities provided on one of the sealing portion sides on the outer peripheral surface. A high-pressure discharge lamp having a base formed with: a reflecting surface for reflecting light emitted from the high-pressure discharge lamp in a predetermined direction; and a central support hole for mounting a base of the high-pressure discharge lamp. A high pressure discharge lamp device comprising: a reflector; and a base cement for fixing a base inserted into a central support hole of the reflector. 7. A light-transmitting hermetic container in which a spherical discharge space portion is formed, a discharge medium sealed in the discharge space portion, and a pair of electrodes arranged to face each other in the discharge space portion. A metal foil connected to each of these electrodes and drawn out to the external lead wire side, a sealing portion in which the electrode and the metal foil portion are sealed under reduced pressure, and a plurality of pieces provided on one of the sealing portion sides on the outer peripheral surface are provided. A high-pressure discharge lamp having a base in which a slit is formed in an axial direction; a reflecting surface for reflecting light emitted from the high-pressure discharge lamp in a predetermined direction; and a central support hole for mounting a base of the high-pressure discharge lamp. A high-pressure discharge lamp device comprising: a concave reflecting mirror having: a base cement for fixing a base inserted into a central support hole of the reflecting mirror. 8. The high-pressure discharge lamp has a small-diameter portion in a part of the sealing portion located in the base, and a narrowed portion fitted in the small-diameter portion of the sealing portion in a part of the base; The high-pressure discharge lamp device according to claim 7. 9. A high-pressure discharge lamp device according to claim 5, a liquid crystal display panel irradiated with light from the high-pressure discharge lamp device, and a liquid crystal drive device for driving the liquid crystal display panel. And an optical system for projecting light that has passed through the liquid crystal display panel onto a surface to be projected.